Volcanoes

How are volcanoes formed?

• Jian made them

• When tectonic plates move and magma rises through the Earth's crust

• When earthquakes create holes in the ground

• When magma cools and hardens inside the Earth, forming pressure

When magma reaches the surface, what is it called?

• Surface Magma

• Essence of Hephaestus

• Igneous Rock

• Lava

(Were you listening to Ma'am Shaima?)

What type of volcano is characterized by low and flat shape and

have small, flowing eruptions?

• Cinder Cone

• Caldera

• Shield Volcano

• Stratovolcano

What is a dormant volcano?

• Hasn't erupted in 100 years

• May erupt in the future but not now

• Likely to erupt soon

• A volcano that's taking a 30 minute break

What subject is this? (Get this right or else..)

Which of the following describes an effusive eruption?

• A sudden, violent explosion that sends ash and gases high into the atmosphere

• A powerful eruption that creates pyroclastic flows and volcanic bombs

• Lava flows steadily out of a volcano with low explosiveness

• An eruption that blasts a large crater and causes widespread ashfall

What does PHIVOLCS stand for?

• Philippine International Volcanoes and Seismology

• Philippine Institute of Volcanology and Seismology

• Philippine Institution for Volcanic and Seismic Studies

• Pogi Handsome Intelligent Valuable Obedient and Lively Chads

Which of these volcanoes are not found in the Philippines?

• Taal Volcano

• Mount Mayon

• Mount Palapal

• Mount Kanlaon

Which of the following is a possible sign of an impending volcanic eruption?

• Sudden drop in temperature near the volcano

• Decrease in steam and gas emissions from the crater

• Heavy rainfall causing flooding near the volcano

• Increased frequency of volcanic quakes with rumbling sounds

What is lahar?

• A heavy shower of fine volcanic ash that can cover wide areas and cause breathing problems

• Invisible gases released by a volcano that may be toxic or cause acid rain
  

• A fast-moving mudflow of water, volcanic debris, and pyroclastic material that flows down volcanoes

• A fast, extremely hot avalanche of gas, ash, and rock that flows down the sides of a volcano